/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.tracker.imports;

import lombok.RequiredArgsConstructor;
import org.apache.commons.lang3.StringUtils;
import org.hisp.dhis.common.IdentifiableObjectManager;
import org.hisp.dhis.tracker.imports.preheat.mappers.FullUserMapper;
import org.hisp.dhis.user.CurrentUserUtil;
import org.hisp.dhis.user.User;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 * Specialized User Service for Tracker that executes User look-up in a read-only transaction
 *
 * @author Luciano Fiandesio
 */
@RequiredArgsConstructor
@Service
public class TrackerUserService {

  private final IdentifiableObjectManager manager;

  /**
   * Fetch a User by user uid
   *
   * @param userUid a User uid
   * @return a User
   */
  @Transactional(readOnly = true)
  public User getUser(String userUid) {
    User user = null;

    if (!StringUtils.isEmpty(userUid)) {
      user = manager.get(User.class, userUid);
    }
    if (user == null) {
      user = manager.get(User.class, CurrentUserUtil.getCurrentUserDetails().getUid());
    }
    // Make a copy of the user object, retaining only the properties
    // required for
    // the import operation
    return FullUserMapper.INSTANCE.map(user);
  }
}
